feat: add trigger to pipeline (#3)

Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Reviewed-on: #3

.drone.yaml

@@ -3,6 +3,12 @@ type: docker
 
 name: build-and-push-container
 
+triggers:
+  branch:
+    - main
+  event:
+    - push
+
 steps:
   - name: build
     image: docker:20
@@ -10,11 +16,6 @@ steps:
       - COMMIT_HASH=$(git rev-parse --short HEAD)
       - IMAGE_TAG=gitea.t000-n.de/t.behrendt/backupsidecar:$COMMIT_HASH
       - docker build -t $IMAGE_TAG .
-    when:
-      event:
-        - push
-      ref:
-        - refs/heads/main
 
   - name: push
     image: plugins/docker
@@ -27,8 +28,3 @@ steps:
       tags: 
         - latest
         - $COMMIT_HASH
-    when:
-      event:
-        - push
-      ref:
-        - refs/heads/main